Nature

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Across
  1. 4. a landform with high elevation and high relief
  2. 5. a tall plant that has a wooden trunk and branches
  3. 6. someone whose job is to stop fires
  4. 8. an area of land that is lower than the land around it
  5. 9. a large fire that spreads quickly over a natural area
  6. 12. H2O
  7. 13. a small body of water
  8. 15. ice crystals from the sky
  9. 16. woods
Down
  1. 1. a measure of how hot or cold something is
  2. 2. a sudden spark from the clouds
  3. 3. 空气
  4. 5. the sound caused by lightning
  5. 6. overflow of water in a dry area
  6. 7. a mound of land, smaller than a mountain
  7. 9. moving air
  8. 10. a person who works on a farm
  9. 11. water falling from the sky
  10. 14. a long period of dry weather
  11. 17. the space over the Earth